Estimation of magnetization loss at angular magnetic field using perpendicular magnetization loss in striated and transposed YBCO coated conductor

Lee, J.K.; Kim, W.S.; Park, C.; Byun, S.B.; Han, Byoung-Wook; Lee, S.; Park, S.; Choi, Kyeongdal

doi:10.1016/j.physc.2009.05.052

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…A much stronger dependence is observed for the coupled cable, especially at low fields, and ascribed to the coupling between the strands; at higher fields the coupling contribution is less important and the loss curves for different frequencies converge Roebel cables with striated strands have been assembled. The strand striation further reduces the loss [28,30,31,91] see Figure 21; however, the effectiveness of this method for reducing the loss in practical application has still to be proven, because in the experimental set-up: the filaments are electrically isolated from each other at the ends, and hence there are no coupling currents, whereas in real situations the filaments will be coupled at the ends. The concept of additional transposition by means of the more complex structure of a Rutherford cable with Roebel cables used as strands was proposed in [53] and tested with applied Roebel strands recently [54].…”

Section: Magnetization Lossmentioning

confidence: 99%

“…Striations of the strands. Striations were successfully applied to Roebel strands by laser grooving (five filaments of 1 mm width, see figure 9) and an effect on the ac loss behaviour was observed [29][30][31][32], although further systematic investigations are needed for a deeper understanding. The applied striations, however, already showed the importance of sufficient conductor homogeneity and the absence of defects.…”

Section: Design Options and Modificationsmentioning

confidence: 99%

See 1 more Smart Citation

Roebel cables from REBCO coated conductors: a one-century-old concept for the superconductivity of the future

Goldacker

Grilli

Pardo

et al. 2014

Supercond. Sci. Technol.

264

139

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Energy applications employing high-temperature superconductors (HTS), such as motors/generators, transformers, transmission lines and fault current limiters, are usually operated in the alternate current (AC) regime. In order to be efficient, the HTS devices need to have a sufficiently low value of AC loss, in addition to the necessary current-carrying capacity. Most applications are operated with currents beyond the current capacity of single conductors and consequently require cabled conductor solutions with much higher current carrying capacity, from a few kA to up to 20-30 kA for large hydro-generators.A century ago, in 1914, Ludwig Roebel invented a low-loss cable design for copper cables, which was successively named after him. The main idea behind Roebel cables is to separate the current in different strands and to provide a full transposition of the strands along the cable direction. Nowadays, these cables are commonly used in the stator of large generators. Based on the same design concept of their conventional material counterparts, HTS Roebel cables from REBCO coated conductors were first manufactured at the Karlsruhe Institute of Technology (KIT) and have been successively developed in a number of varieties that provide all the required technical features such as fully transposed strands, high transport currents and low AC losses, yet retaining enough flexibility for a specific cable design. In the past few years a large number of scientific papers have been published on the concept, manufacturing and characterization of such cables. Times are therefore mature for a review of those results. The goal is to provide an overview and a succinct and easy-to-consult guide for users, developers, and manufacturers of this kind of HTS cables.

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Section: Magnetization Lossmentioning

confidence: 99%

Section: Design Options and Modificationsmentioning

confidence: 99%

Roebel cables from REBCO coated conductors: a one-century-old concept for the superconductivity of the future

Goldacker

Grilli

Pardo

et al. 2014

Supercond. Sci. Technol.

264

139

View full text Add to dashboard Cite

show abstract

“…A paper by Lee et al (2009) addresses the effect of striations, transposition and coupling of strands at the end of the conductor on AC losses in magnetic measurements. The authors show that width reduction of strands is effective in reducing hysteresis losses from coated conductors.…”

Section: Ac Losses In CC Roebel Cablesmentioning

confidence: 99%

High temperature superconductor (HTS) cables

Schlachter

Goldacker

2012

High Temperature Superconductors (HTS) for Energy Applications

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“…To reduce the AC loss from a bundle of the HTS single wires, we need to focus on the reduction of the magnetization loss by external magnetic field, because the magnetic field applied perpendicularly on the wide face of the HTS wire is generally dominates the AC loss characteristics of it. Theoretically, the magnetization loss can be reduced by making fine superconducting filaments and decoupling between them by twisting them [3][4][5]. We have investigated the effect of the striation as a substitution of the filament in the concept of the HTS compact cable, which has been proposed by a research group of NIST and University of Colorado for large current conductor [6,7].…”

Section: Introductionmentioning

confidence: 99%

Test result of striated HTS compact cables for low AC loss

Kim¹,

Kim²,

Lee³

2013

Progress in Superconductivity and Cryogenics

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Large AC loss from the second generation (2G) high temperature superconducting (HTS) wires has been one of the major bottlenecks in power applications with HTS materials. Moreover, the large power applications also require the large current capacity from the HTS wires, which makes them produce larger AC losses. In order to reduce the AC loss from the HTS conductors with large current capacity, an HTS compact cable with some striations on the superconducting layers has been proposed. In this paper, we prepared some sample HTS compact conductors with striations, and measured their magnetization loss from the external magnetic field. We also made some slits on the superconducting layer of the HTS wire by laser cutting to reduce the aspect ratio of the superconducting layers. It would make the low eddy current loss and magnetic decoupling. Finally, the magnetization losses of the sample HTS compact conductors were measured and analyzed.

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Estimation of magnetization loss at angular magnetic field using perpendicular magnetization loss in striated and transposed YBCO coated conductor

Cited by 10 publications

References 9 publications

Roebel cables from REBCO coated conductors: a one-century-old concept for the superconductivity of the future

Roebel cables from REBCO coated conductors: a one-century-old concept for the superconductivity of the future

High temperature superconductor (HTS) cables

Test result of striated HTS compact cables for low AC loss

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